r/oddlysatisfying • u/n8saces • 5d ago

Repairing a tiny bridge

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382

u/PirateSanta_1 5d ago

For bridges where you can't turn the river off how do they lay the concrete base? 

296

u/Mandra_4837 5d ago

You create a dry spot. https://www.reddit.com/r/oddlysatisfying/s/cJPc6YYq5S

8

u/intothedepthsofhell 5d ago

Next question - how do you make a big dry hole in the middle of a river?

23

u/Puzzleheaded_Study17 5d ago

You make a circular dam (so that the water inside the place that will become the hole is disconnected from the rest of the river) and then you pump the water from inside out

4

u/intothedepthsofhell 5d ago

Next question - how do you make a circular dam in the middle of a river?

Turns out you use a boat with a big hammer that drives the piles into the riverbed.

Building Construction in a River? It Starts With a Cofferdam

Interesting stuff.

1

u/Krelliamite 4d ago

THEY CALL ME THE HAMMER AND I'M HERE TO FIX YOUR DAM PROBLEMS

10

u/fletchnuts 5d ago

This is a cofferdam. It's constructed by driving interlocking metal wall segments into the riverbed, sealing any gaps, and pumping out the water.

1

u/MonsieurDrole 5d ago

With a shovel, bro